<!DOCTYPE html>

<style>
  body {
    margin: 0px;
  }
</style>

<meta name="viewport" content="width=1600">
<div style="width: 2000px; height: 10px; background-color: blue"></div>
<script>
  var innerWidth = window.innerWidth;
  var innerHeight = window.innerHeight;
  document.write('<div id="output">'+innerWidth+'x'+innerHeight+'</div>');
</script>

